Regarding the Redmi6/6A upgrade to the MIUI12 stable version, the following instructions are given. After a year of adaptation, the MIUI12 stable version of the Redmi6 and Redmi6A models are ready for upgrade.

However, after testing by the mobile phone software R&D department, due to the insufficient hardware performance of the two models, the MIUI12 stable version cannot meet the OTA full release Redmi6/6A quality standards. After careful consideration, the two models do not do OTA full push, but only provide fastboot packages to friends who want to try it out using manual flashing.

It should be noted that the two machines cannot run smoothly after upgrading to the MIUI12 stable version, and there will be stalls and slow application startup. Please consider upgrading carefully. After upgrading the MIUI12 stable version and then downgrading the line, data loss will occur.

Read the official announcement in Chinese here.

@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available!
Device: Mi 9 Pro 5G China
Codename: #crux
Type: Stable Fastboot
Version: V12.5.1.0.RFXCNXM | 11.0
Size: 4.2 GB
MD5: 3ae22141fddc699269dabd42f936e8ce
Changelog:
(System)
New: Response to gestures is now instant.
New: With 20 times more rendering power, there are now few limits to what you can see on your screen.
New: With custom device model adjustments, any phone becomes faster after the upgrade.
Optimization: MIUI became lighter, faster, and more durable.
Updated Android Security Patch to May 2021. Increased system security.
Stable MIUI based on Android 11
(Notes)
New: A gesture shortcut now allows you to create notes, tasks, and excerpts anywhere.
New: Excerpts save text, URLs, and images to Notes in a few simple taps.
New: Dynamic layouts bring the typography in Notes to a new level.
New: Compose mind maps with complex structures.
New: New tools for doodling and sketching.
New: Press and hold a sketch to adjust the strokes automatically.
All-new Notes.
(Xiaomi Cloud)
New: Location info can be now reported automatically before the device is powered off


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available!
Device: Mi 10T / Mi 10T Pro Indonesia
Codename: #apollo
Type: Stable Fastboot
Version: V12.5.1.0.RJDIDXM | 11.0
Size: 4.7 GB
MD5: 2f66a94fda6e1d7c1b05c0a9e1a15440
Changelog:
(System)
Updated Android Security Patch to May 2021. Increased system security.
(Xiaomi Cloud)
New: Location info can be now reported automatically before the device is powered off


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available!
Device: Mi 10T / Mi 10T Pro Taiwan
Codename: #apollo
Type: Stable Fastboot
Version: V12.5.1.0.RJDTWXM | 11.0
Size: 4.0 GB
MD5: 9b5d50a7a7606a972309bac05468fd75
Changelog:
(System)
Updated Android Security Patch to May 2021. Increased system security.
(Xiaomi Cloud)
New: Location info can be now reported automatically before the device is powered off


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available! (via OTA)
Device: Mi CC 9 China
Codename: #pyxis
Type: Stable Beta Recovery
Version: V12.5.3.0.RFCCNXM | 11.0
Size: 2.6 GB
MD5: 123bbbed2888c1a798528c8c9658edfa
Changelog:
(System)
New: Response to gestures is now instant.
New: With 20 times more rendering power, there are now few limits to what you can see on your screen.
New: With custom device model adjustments, any phone becomes faster after the upgrade.
Optimization: MIUI became lighter, faster, and more durable.
(System animations)
New: New UI design is focused on visualization and making your interaction with the device more lifelike.
New: A new animation framework renders movement more realistically.
(Notes)
New: Compose mind maps with complex structures.
New: New tools for doodling and sketching.
New: Press and hold a sketch to adjust the strokes automatically.
New: A gesture shortcut now allows you to create notes, tasks, and excerpts anywhere.
New: Excerpts save text, URLs, and images to Notes in a few simple taps.
New: Dynamic layouts bring the typography in Notes to a new level.
All-new Notes.
(Privacy protection)
New: The behavior of web pages is also tracked now, which helps you to block unwanted and malicious actions.
New: Now it's up to you who and when can track your online behavior.
New: All apps now come with a security statement from GetApps.
New: Privacy risk scanner.
New: Control which apps access and delete items from your Gallery.
New: A comprehensive overview of all sensitive permissions.
New: You'll be notified whenever high-risk permissions are used and will be able to block the corresponding actions.
New: Now you can see what apps access your clipboard and control access.
New: Using approximate location adds up points to privacy protection.
New: You can now manage sensitive permissions and related app behavior independently.
Optimization: An all-new privacy protection page.
(Floating windows)
New: Instant messengers now support floating windows.
New: Floating windows can be quickly replaced with fullscreen versions of the apps.
New: App flashcards Show key info when apps are displayed as floating windows.
*Learn more about new features in "Special features".
(Xiaomi Cloud)
New: Convert images to PDF.
New: Password manager allows you to store passwords in the cloud.
New: You can share device location with other people in your family sharing group.
New: Location information can be recorded automatically before the device powers off.
(IME)
New: A more convenient way to move a cursor using the scrollbar.
New: Function buttons support switching between languages and keyboards.
New: You can press and hold the function buttons to access more features.
New: Custom themes for keyboards.
(Themes)
New: Font weight adjustment options for third party fonts.
Optimization: Personalization features for system wallpapers, animations, and sounds.
(Browser)
New: Wallpaper customization in the lite mode.
Optimization: Redesigned Incognito mode.
Optimization: Pages load much faster now.


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available! (via OTA)
Device: Redmi Note 10 5G China
Codename: #camellia
Type: Stable Beta Recovery
Version: V12.0.7.0.RKSCNXM | 11.0
Size: 2.7 GB
MD5: edca09dff10d9a6e688c2d792751e4bd
Changelog:
(Other)
Optimized system performance
Improved system security and stability


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available!
Device: Redmi K30 4G China
Codename: #phoenix
Type: Stable Fastboot
Version: V12.5.1.0.RGHCNXM | 11.0
Size: 4.2 GB

@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available!
Device: Mi Max 3 China
Codename: #nitrogen
Type: Stable Fastboot
Version: V12.5.1.0.QEDCNXM | 10.0
Size: 3.0 GB
MD5: b3f92af01fdb4ea324d01e751a38afe2
Changelog:
(System)
New: Response to gestures is now instant.
New: With 20 times more rendering power, there are now few limits to what you can see on your screen.
New: With custom device model adjustments, any phone becomes faster after the upgrade.
Optimization: MIUI became lighter, faster, and more durable.
(System sounds)
New: Nature mix is a new exciting way of creating your own notification sound system.
New: Hundreds of system sounds that represent animals from all around the world.
(System animations)
New: A new animation framework renders movement more realistically.
New: New UI design is focused on visualization and making your interaction with the device more lifelike.
(Notes)
New: Compose mind maps with complex structures.
New: New tools for doodling and sketching.
New: Press and hold a sketch to adjust the strokes automatically.
New: A gesture shortcut now allows you to create notes, tasks, and excerpts anywhere.
New: Excerpts save text, URLs, and images to Notes in a few simple taps.
New: Dynamic layouts make bring the typography in Notes to a new level.
All-new Notes.
(Privacy protection)
New: Now you can see what apps access your clipboard and control access.
New: Using approximate location adds up points to privacy protection.
New: You can now manage sensitive permissions and related app behavior independently.
New: The behavior of web pages is also tracked now, which helps you to block unwanted and malicious actions.
New: Now it's up to you who and when can track your online behavior.
New: All apps now come with a security statement from GetApps.
New: Privacy risk scanner.
New: Control which apps access and delete items from your Gallery.
New: A comprehensive overview of all sensitive permissions.
New: You'll be notified whenever high-risk permissions are used and will be able to block the corresponding actions.
Optimization: An all-new privacy protection page.
(Xiaomi Cloud)
New: Location info can be now reported automatically before the device is powered off
(IME)
New: A more convenient way to move a cursor using the scrollbar.
New: Function buttons support switching between languages and keyboards.
New: You can press and hold the function buttons to access more features.
New: Custom themes for keyboards.
(Themes)
New: Font weight adjustment options for third party fonts.
Optimization: Personalization features for system wallpapers, animations, and sounds.
(Browser)
New: Wallpaper customization in the lite mode.
Optimization: Redesigned Incognito mode.
Optimization: Pages load much faster now.


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available!
Device: Redmi 9T Taiwan
Codename: #lime
Type: Stable Fastboot
Version: V12.0.5.0.QJQTWXM | 10.0
Size: 3.7 GB
MD5: aff29aed686bc01360e0815671a349ee
Changelog:
(Other)
Optimized system performance
Improved system security and stability


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available!
Device: Mi 10 Pro China
Codename: #cmi
Type: Stable Fastboot
Version: V12.5.5.0.RJACNXM | 11.0
Size: 4.8 GB
MD5: 6590f023192490bb8df7daa5f51f3a51
Changelog:
(Other)
Optimized system performance
Improved system security and stability


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available!
Device: Redmi Note 9 EEA
Codename: #merlin
Type: Stable Fastboot
Version: V12.0.1.0.RJOEUXM | 11.0
Size: 4.7 GB
MD5: e43ec8aa790a6b6f81edf529be2bb42a
Changelog:
(System)
Updated Android Security Patch to May 2021. Increased system security.
(Xiaomi Cloud)
New: Location info can be now reported automatically before the device is powered off


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available!
Device: POCO F2 Pro EEA
Codename: #lmi
Type: Stable Fastboot
Version: V12.5.1.0.RJKEUXM | 11.0
Size: 5.3 GB
MD5: 75e163eddde3e54c94b73754e7b77971
Changelog:
(System)
New: Response to gestures is now instant.
New: With 20 times more rendering power, there are now few limits to what you can see on your screen.
New: With custom device model adjustments, any phone becomes faster after the upgrade.
Optimization: MIUI became lighter, faster, and more durable.
(Notes)
New: A gesture shortcut now allows you to create notes, tasks, and excerpts anywhere.
New: Excerpts save text, URLs, and images to Notes in a few simple taps.
New: Dynamic layouts bring the typography in Notes to a new level.
New: Compose mind maps with complex structures.
New: New tools for doodling and sketching.
New: Press and hold a sketch to adjust the strokes automatically.
All-new Notes.
(Xiaomi Cloud)
New: Location info can be now reported automatically before the device is powered off


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available! (via OTA)
Device: Mi 11i Global
Codename: #haydn
Type: Stable Recovery
Version: V12.5.1.0.RKKMIXM | 11.0
Size: 3.2 GB
MD5: 49de2d69abe2751296f68192d212705d
Changelog:
(System)
New: Response to gestures is now instant.
New: With 20 times more rendering power, there are now few limits to what you can see on your screen.
New: With custom device model adjustments, any phone becomes faster after the upgrade.
Optimization: MIUI became lighter, faster, and more durable.
Updated Android Security Patch to June 2021. Increased system security.
(Notes)
New: Press and hold a sketch to adjust the strokes automatically.
New: A gesture shortcut now allows you to create notes, tasks, and excerpts anywhere.
New: Excerpts save text, URLs, and images to Notes in a few simple taps.
New: Dynamic layouts bring the typography in Notes to a new level.
New: Compose mind maps with complex structures.
New: New tools for doodling and sketching.
All-new Notes.
(Status bar, Notification shade)
Fix: Notifications flashed in some cases


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available!
Device: Mi 11i Global
Codename: #haydn
Type: Stable Fastboot
Version: V12.5.1.0.RKKMIXM | 11.0
Size: 5.9 GB
MD5: 9dad0efd7627fe7a4fe28bb050c9b943
Changelog:
(System)
New: Response to gestures is now instant.
New: With 20 times more rendering power, there are now few limits to what you can see on your screen.
New: With custom device model adjustments, any phone becomes faster after the upgrade.
Optimization: MIUI became lighter, faster, and more durable.
Updated Android Security Patch to June 2021. Increased system security.
(Notes)
New: Press and hold a sketch to adjust the strokes automatically.
New: A gesture shortcut now allows you to create notes, tasks, and excerpts anywhere.
New: Excerpts save text, URLs, and images to Notes in a few simple taps.
New: Dynamic layouts bring the typography in Notes to a new level.
New: Compose mind maps with complex structures.
New: New tools for doodling and sketching.
All-new Notes.
(Status bar, Notification shade)
Fix: Notifications flashed in some cases


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available!
Device: Redmi Note 10 Pro Taiwan
Codename: #sweet
Type: Stable Fastboot
Version: V12.5.1.0.RKFTWXM | 11.0
Size: 4.0 GB

@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available! (via OTA)
Device: Mi 11 Lite 5G Global
Codename: #renoir
Type: Stable Beta Recovery
Version: V12.5.2.0.RKIMIXM | 11.0
Size: 3.2 GB
MD5: ab83d0ceea4b7768b28963a5600a461e
Changelog:
(Other improvements and optimizations)
Optimization: Video picture quality
Optimization: Touchscreen experience
Fix: Screen brightness was adjusted slower than expected in some cases


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available! (via OTA)
Device: Mi 11 Lite 5G EEA
Codename: #renoir
Type: Stable Beta Recovery
Version: V12.5.3.0.RKIEUXM | 11.0
Size: 3.2 GB
MD5: 916fd07eb16c3c286224c5220668101c
Changelog:
(Other improvements and optimizations)
Optimization: Video picture quality
Optimization: Touchscreen experience
Fix: Screen brightness was adjusted slower than expected in some cases


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available! (via OTA)
Device: Mi 11X India
Codename: #alioth
Type: Stable Beta Recovery
Version: V12.5.2.0.RKHINXM | 11.0
Size: 3.1 GB
MD5: fa6380720de9e23eb7cdcea618ceacb8
Changelog:
(Status bar, Notification shade)
Fix: Notifications flashed in some cases


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available! (via OTA)
Device: Mi Note 10 / Note 10 Pro EEA
Codename: #tucana
Type: Stable Beta Recovery
Version: V12.5.1.0.RFDEUXM | 11.0
Size: 3.1 GB
MD5: 75f8f5f7c7fefd55dfda6c19294b3fc4
Changelog:
(System)
New: Response to gestures is now instant.
New: With 20 times more rendering power, there are now few limits to what you can see on your screen.
New: With custom device model adjustments, any phone becomes faster after the upgrade.
Optimization: MIUI became lighter, faster, and more durable.
(Notes)
New: Compose mind maps with complex structures.
New: New tools for doodling and sketching.
New: Press and hold a sketch to adjust the strokes automatically.
New: A gesture shortcut now allows you to create notes, tasks, and excerpts anywhere.
New: Excerpts save text, URLs, and images to Notes in a few simple taps.
New: Dynamic layouts bring the typography in Notes to a new level.
All-new Notes.
(Xiaomi Cloud)
New: Location info can be now reported automatically before the device is powered off


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available! (via OTA)
Device: POCO F2 Pro Global
Codename: #lmi
Type: Stable Beta Recovery
Version: V12.5.1.0.RJKMIXM | 11.0
Size: 3.2 GB
MD5: 00d73fe8e2463e5d0e94a3b8dac060b6
Changelog:
(System)
New: Response to gestures is now instant.
New: With 20 times more rendering power, there are now few limits to what you can see on your screen.
New: With custom device model adjustments, any phone becomes faster after the upgrade.
Optimization: MIUI became lighter, faster, and more durable.
Stable MIUI based on Android 11
Updated Android Security Patch to June 2021. Increased system security.
(Notes)
New: Dynamic layouts bring the typography in Notes to a new level.
New: Compose mind maps with complex structures.
New: New tools for doodling and sketching.
New: Press and hold a sketch to adjust the strokes automatically.
New: A gesture shortcut now allows you to create notes, tasks, and excerpts anywhere.
New: Excerpts save text, URLs, and images to Notes in a few simple taps.
All-new Notes.
(Xiaomi Cloud)
New: Location info can be now reported automatically before the device is powered off
(Status bar, Notification shade)
Fix: Lock screen notification animations froze after the device was unlocked using face data
Fix: Notifications flashed in some cases
Fix: Floating notifications weren't displayed correctly in landscape mode
Fix: Notification badges weren't updated for incoming notifications on a locked device


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater

New update available! (via OTA)
Device: Redmi Note 10 Pro Russia
Codename: #sweet
Type: Stable Beta Recovery
Version: V12.5.2.0.RKFRUXM | 11.0
Size: 3.0 GB
MD5: 51cc2ca7fc24aa6e67c089aa27ce815b
Changelog:
(Highlights)
New: Dolby effects
(System)
New: Response to gestures is now instant.
New: With 20 times more rendering power, there are now few limits to what you can see on your screen.
New: With custom device model adjustments, any phone becomes faster after the upgrade.
Optimization: MIUI became lighter, faster, and more durable.
(Notes)
New: Compose mind maps with complex structures.
New: New tools for doodling and sketching.
New: Press and hold a sketch to adjust the strokes automatically.
New: A gesture shortcut now allows you to create notes, tasks, and excerpts anywhere.
New: Excerpts save text, URLs, and images to Notes in a few simple taps.
New: Dynamic layouts bring the typography in Notes to a new level.
All-new Notes.
(Xiaomi Cloud)
New: Location info can be now reported automatically before the device is powered off
(Status bar, Notification shade)
Fix: Lock screen notification animations froze after the device was unlocked using face data
Fix: Notifications flashed in some cases
Fix: Floating notifications weren't displayed correctly in landscape mode
Fix: Notification badges weren't updated for incoming notifications on a locked device
(Camera)
New: Animations for the automatic Night mode
New modes for recording video and time-lapse photography, as well as a new set of filters (BBP, Mystery, Lime, Tango, Fantasy, Slumber, Carmen, Summer)


@MIUIUpdatesTracker | @XiaomiFirmwareUpdater